thx m8s, i thought the best temps are between 23-25°. Regulary i have between 25-27° (arround buds) at the roof top even 30°. As iam a perfectionist i wanted to eliminate those 30° at the rooftop cause i thought i could harm the plants in any way. But after reading the first link from lamsbread, seems to be all good. Maybe the Grow Gurus came to a new conclusion over the last years. And 27-30° are respectable for a grow, as when the sun burns, the plant cant get away from the heat, outdoors. Sounds plausibel to me. @Urbanninja, you know how it goes cold room, sophisticated ventilation and (sometimes cooltube, but i only use it if i have to, cause it minimizes the lumen:) I for sure thought about those LED´s, but till now nothing really convinced me. As the infos are very less and there are still voices heard saying the yield is not comparable to a hsp. Guess i have to make a testgrow and come to my on conclusion. thx so far and make the world green

what might be better , having a higher lumen but therefore more heat in the room. or a lower lumen and lower heat in the room? what is more important for a good harvest? lumen or heat?

and yeah, in other videos they mentioned the rockwool thing + something i cant confirm,cause of bad spelling or lousy acoustic? dont know. and of course soil. am i right when they compare hydro vs. soil. they gave no nutrients to the soil? only water? thats pretty mean. in it?

i have a question lil bit offtopic, how often do you have to change the water itself going hydro? do you use the water/nutrients from the beginning til the end of flowering? or you change the water periodly?

i had 3 Vanilla Kush and 2 Pinapple Chunk, all Vk geminated and the pheno type described as small applied to all of them, 1 was bonsai like, which i never saw before. From the PC 1 geminated and the plant was 1 bad motherfucker. I had a leck of light for a few hours. the VK reacted pretty sissi like, while the PC stood stable in her growth. The smell of the PC was epic, VK well. dont know, maybe i never smelled real Vanilla before

thank you guys so far

Why there is no exact setup of this hydroponic system and nutrients they use in this video as well as on the ohter videos. i would like to switch to hydroponic but not sure what tu use. To be able to compare the reslult between my own and of ghsc, i would like to have the same setup as shown in this video. plz heeeelp